Mine does that when it found encrypted stuff.
It will record the hit, and says it is recording. But it don't actually record the audio to play it back.
So based on my personal experience, I would say that your scanner was in the discovery mode and it was picking up the encryption. It logged the hit, but doesn't actually record the audio like it says it is doing.
When I first encountered the same issue on my end, I was wondering WTF was going on. So I decided to go to those freq. and monitor them to see why it was doing that. Actually on a few of the freqs. and they all were encrypted.